[ticket/11628] Remove style resource locator

No longer used since Twig was implemented.

PHPBB3-11628
[ticket/11628] Remove style path provider

No longer used since Twig was implemented.

PHPBB3-11628
[ticket/11628] Remove phpbb_style (move methods to phpbb_template)

PHPBB3-11628
[ticket/11628] Remove $this->names, $this->style_names from phpbb_template

These are not used anywhere

PHPBB3-11628
[ticket/11628] Move setting core namespace to set_style()

PHPBB3-11628
[ticket/11628] Return $this from set_style, set_custom_style

PHPBB3-11628
[ticket/11628] Remove third parameter ($names) from set_custom_style

This was basically duplicating functionality. $names would be used if not
empty, else array($name) would be used. Merged functionality into the first
argument

PHPBB3-11628
[ticket/11628] Change set_custom_style $template path to default to string

Rather than default to false and compare === false ? 'template/' : value just
assign this default in the arguments

PHPBB3-11628
[ticket/11628] Set admin namespace in the constructor

PHPBB3-11628
[ticket/11628] Remove set_style_names function, moved to set_custom_style

PHPBB3-11628
[ticket/11628] Remove template_path option on set_custom_style

This was set to default 'template/' to append template/ to all the paths,
but every location was actually just setting it to '' to not append anything.
So removed the option entirely (additional paths can be appended to the paths
being sent to the function already)

PHPBB3-11628
[ticket/11628] Shorten an if to an inline statement

PHPBB3-11628
[ticket/11628] Remove the one usage of get_style_path()

Makes the code easier to follow

PHPBB3-11628
[ticket/11628] Fix a bug I noticed in template->destroy

Should not be setting $this->context = array()!

PHPBB3-11628
[ticket/11628] Make get_template_vars protected

Remove all references to it and the hacky code in messenger that was using it

PHPBB3-11628
[ticket/11628] Remove remaining style_path_provider_test

PHPBB3-11628
[ticket/11628] phpbb_template, not phpbb_template_interface

PHPBB3-11628
Merge branch 'develop' of github.com:phpbb/phpbb3 into ticket/11628

# By Bruno Ais (42) and others
# Via Joas Schilling (39) and others
* 'develop' of github.com:phpbb/phpbb3: (157 commits)
  [ticket/11803] Revert POLL_MAX_OPTIONS min value to 0
  [ticket/11799] Send anti abuse headers in "new password" emails.
  [ticket/11792] Add functional test for var lang_set_ext of core.user_setup
  [ticket/11804] Remove </li> from overall_header which was not open
  [ticket/11802] replace $browser with $user->browser
  [ticket/11801] removed some whitespace and added missing semi colon's in css
  [ticket/11792] Add performance remark to core.user_setup event PHPDoc
  [ticket/11792] Add variable 'lang_set_ext' to event core.user_setup
  [ticket/11789] Remove inline color in memberlist_view
  [ticket/11800] Fix scripts variable in subsilver simple_footer
  [ticket/11800] Fix JavaScript in simple_footer.html
  [ticket/11800] Remove forum_fn from memberlist_search.html
  [ticket/11796] Replace pagination with pagination.html
  [ticket/11794] Add missing array element commas to docs/coding-guidelines.html
  [ticket/11775] Fix doc blocks syntax
  [ticket/11775] Remove spaces at line ends
  [ticket/11789] Remove colors from HTML code
  [ticket/11784] Remove naming redundancy for event listeners
  [ticket/11775] Split test into multiple steps
  [ticket/11777] Fix new test for loop variables in extension template listeners
  ...

Conflicts:
	phpBB/install/index.php
	phpBB/install/install_update.php
[ticket/11628] Create base template class with common functions

E.g. assign_vars

PHPBB3-11628
Merge remote-tracking branch 'EXreaction/ticket/11628' into develop